Fan grille of an air conditioning unit



FIG. 1 is a top plan view of a fan grille of an air conditioning unit, showing our new design;

FIG. 2 is a front elevational view thereof, with all side views being identical therewith; and,

FIG. 3 is a bottom plan view thereof.

The broken line showing of environmental structure in FIG. 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a fan grill of an air conditioning unit, as shown and described. 